10 Jun Tubular
Before Gary’s M5 returned to his possession, we had one last thing lined up for it.
In preparation for its eventual velocity stack addition, we deleted the MAF sensors and relocated his IAT sensor. Since the intake pipes looked awfully weird without the MAFs plugged in, we went about fabricating him a replacement set of pipes out of aluminum. We cut the airbox end of the intake out on the mill, so the connection is 100% stock at the airbox, and the routing is essentially the same, as well. We’d like to think it’s a good addition to the engine, at least until the stacks are ready. Take a look:
We also filmed some video of his M5 on the dyno, post exhaust install. Take a look below.
alex
Posted at 16:19h, 10 JuneNice! Sounds great on the dyno!
What kind of numbers did it put down?
Did you guys do any before/after pulls with the exhaust, intake, and tune?
Again awesome work! I’m sure the owner will be very pleased.
fluidmotorunion
Posted at 11:28h, 13 JuneHe was quite pleased, yes. The tubing is a similar diameter to the old pipes, so I imagine there’s almost no power change with the new pipes. And for now, our tune was mostly to smooth out the AFRs and give him a nice, safe engine to beat on in racing. Once he comes back for cams and headers (and perhaps the stacks), then we’ll start pushing some power out of the tune. The exhaust probably puts out a good amount of power, as it deleted all the mufflers and catalytic converters, removing almost every point of restriction in the exhaust piping.
alex
Posted at 12:56h, 13 JuneThanks for sharing! Definitely looking forward to future work that you guys are doing. Hopefully next time you’ll be able to share some numbers with us.
Best of luck with all the fabrication!
Gary
Posted at 16:10h, 06 AugustI’m the owner and I’m very pleased. I got a base line dyno a couple of months ago which started this whole project. This is how we found that the MAFS were bad. Why blow $800 on MAFS when you can just blow out the cats and go with an Alpha-N tune? There was a 35 whp gain from stock when all was done not to mention the MAFS tube replacements look really cool and the exhaust sounds unbelievable.